Growth and Physiological Responses to Drought Stress in Four Oleander Clones

Niu, Genhua; Rodriguez, Denise S.; Mackay, Wayne A.

doi:10.21273/jashs.133.2.188

Cited by 60 publications

(30 citation statements)

References 31 publications

(38 reference statements)

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“…For example, RSR was higher in drought-stressed rice (Oryza sativa) compared with the well-watered plants (Xu et al, 2015). Similar results were reported in other crops, including oleander [Nerium oleander (Niu and Rodriguez, 2008)], cotton [Gossypium hirsutum (Pace et al, 1999)], and arabidopsis [Arabidopsis thaliana (Durand et al, 2016)]. Huang and Gao (2000) reported an increased proportion of 14 C allocated to the root than shoot in tall fescue cultivars under the soil drying condition, with a greater increase in tolerant cultivars, and a higher proportion in the deeper root.…”

Section: Discussionsupporting

confidence: 70%

Differences in Seedling Growth of 23 Creeping Bentgrass Cultivars under Polyethylene Glycol-induced Drought Conditions

Qi¹,

Yang²,

Rue³

2018

hortte

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Drought is the most important abiotic stress in crop production including turfgrass management. Using drought tolerant plants can help minimize stress damage. In this study, 23 commercially available cultivars of creeping bentgrass (Agrostis stolonifera) were evaluated for their responses to drought stress that was induced by polyethylene glycol (PEG) 6000 in a hydroponic system during the seed germination and seedling growth stage. In such a system, water potential was adjusted to 0.0 (the control), −0.3, and −0.6 MPa to mimic the drought condition. The absolute water content (AWC), shoot dry weight (SDW), root dry weight (RDW), longest root length (LRL), specific root length (SRL), and root-to-shoot dry weight ratio (RSR) in the plants grown for 4 weeks in the treatment were determined. Results showed that SDW and LRL were unaffected by drought; however, RDW and RSR increased, whereas SRL and AWC were reduced under drought. Among the 23 creeping bentgrass cultivars evaluated, Independence and Crystal Bluelinks had a higher turfgrass performance index (TPI), which represented the number of times a cultivar ranked in the top statistical group across all parameters. The results suggest that ‘Independence’ and ‘Crystal Bluelinks’ may be more adapted to drought than the other cultivars at the seedling stage.

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Section: Discussionsupporting

confidence: 70%

Differences in Seedling Growth of 23 Creeping Bentgrass Cultivars under Polyethylene Glycol-induced Drought Conditions

Qi¹,

Yang²,

Rue³

2018

hortte

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“…This was considered beneficial for adaptation and surviving a water stress situation (Blum, 1996). Angelonia, heliotrope, carnation, crimson bottlebrush (Callistemon citrinus), geranium (Pelargonium ·hortorum), impatiens, and oleander (Nerium oleander) were reported to have a higher root density or root-to-shoot ratio with lower SMC ( Alvarez et al, , 2011Chyli nski et al, 2007;Guo et al, 2018;Niu et al, 2008;S anchez-Blanco et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

Growth, Quality, and Economic Value Responses of Bedding Plants to Reduced Water Usage

Guo¹,

Starman²,

Hall³

2019

horts

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This study analyzed the effects of two ranges of drying down of substrate moisture content (SMC) before re-watering on plant growth and development, postproduction quality, and economic value of bedding plants grown in 1.67-L containers during greenhouse production. The two SMC treatments were wide-range (WR) SMC (WR-SMC) for dry-down from container capacity (CC) of 54% SMC dried down to 20% SMC or narrow-range (NR) SMC (NR-SMC) for dry-down from CC of 54% SMC dried down to 40% SMC. Six bedding plant cultivars were used [Solenostemon scutellarioides ‘French Quarter’ (coleus); Petunia ×hybrida ‘Colorworks Pink Radiance’ (petunia); Lantana camara ‘Lucky Flame’ (lantana); Impatiens ×hybrida ‘Sunpatiens Compact Hot Coral’ (SCC); ‘Sunpatiens Spreading Lavender’ (SSL) (impatiens); and Salvia splendens ‘Red Hot Sally II’ (salvia)]. Shoot dry weight was reduced with WR-SMC on petunia, lantana, impatiens SCC, and salvia at the end of production. With WR-SMC, the petunia and impatiens SCC root ball coverage percentages were greater on the bottom of the container, whereas those of impatiens SSL and salvia were reduced. The WR-SMC increased petunia postproduction quality by increasing the flower number. Lantana and impatiens SCC inflorescence/flower and/or bud number were reduced with WR-SMC. The impatiens SSL flower number was unaffected by SMC treatment. Salvia grown with WR-SMC had increased postproduction quality. WR-SMC reduced postproduction water potential in petunia, lantana, and coleus, suggesting that plants with WR-SMC during production were acclimated to reduced irrigation administered during postproduction. WR-SMC saved labor due to less frequent watering and overhead-associated costs due to reduced bench space, with the exception of coleus and impatiens SSL, which used the same bench space as NR-SMC. Considering production and/or postproduction quality, using WR-SMC during greenhouse production is beneficial as an irrigation method for coleus, petunia, impatiens SSL, and salvia, but not for impatiens SCC or lantana grown in 1.67-L containers.

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“…Chl fluorescence parameters are often used to indicate the extent of damage to the photosynthetic apparatus (Niu et al 2008). In the present study, CaCl2-treated P. ostii F0 was significantly reduced relative to that of the Control after 12 d. It is indicated that exogenous calcium can alleviate the damage to the PSII reaction center under drought stress to some extent.…”

Section: Discussionmentioning

confidence: 99%

Exogenous calcium-induced physiological and biochemical changes in tree peony (Paeonia section Moutan DC.) under drought stress

Zhang¹,

Fang²,

Liu³

et al. 2019

Photosynt.

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Tree peony (Paeonia section Moutan DC.) is an excellent ornamental plant, of which Paeonia ostii (P. ostii) has a high oil value. It is widely cultivated in China, but severe drought affects its growth. In this study, the effects of exogenous calcium on drought-induced damage of P. ostii were studied. The results showed that under drought stress, leaf water content showed a downward trend, while reactive oxygen species (ROS), relative electrical conductivity (REC), proline (Pro) content, and related antioxidant enzymes increased significantly. Spraying CaCl2 could effectively slow leaf wilting and water loss, induced an increase in enzyme activity of the antioxidant enzyme system, and reduced the accumulation of ROS caused by drought stress. Simultaneously, REC and Pro content could be alleviated, and the degree of cell membrane damage could be reduced. In addition, CaCl2 improved photosynthetic characteristics and chlorophyll fluorescence parameters. These results indicated that CaCl2 reduced the harmful effects of drought stress on the growth of P. ostii by regulating infiltration, activating photosynthesis, and enhancing the antioxidant system. These findings suggested that CaCl2 can be used to manage drought stress in P. ostii cultivation.Additional key words: ascorbate peroxidase; gas exchange; physiological index; relative water content; superoxide dismutase; water stress. (J. Tao) Abbreviations: APX -ascorbate peroxidase; Ci -intercellular CO2 concentration; DAB -diaminobenzidine; DM -dry mass; E -transpiration rate; F0 -minimal fluorescence yield of the dark-adapted state; Fm -maximal fluorescence yield of the dark-adapted state; FM -fresh mass; Fv/Fm -maximal quantum yield of PSII photochemistry; gs -stomatal conductance; PN -net photosynthetic rate; POD -peroxidase; Pro -free proline; qN -nonphotochemical quenching coefficient; REC -relative electrical conductivity; ROS -reactive oxygen species; SOD -superoxide dismutase; Y(II) -effective quantum yield of PSII photochemistry. Acknowledgments: The authors wish to thank two anonymous reviewers for their input and constructive criticism.

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Growth and Physiological Responses to Drought Stress in Four Oleander Clones

Cited by 60 publications

References 31 publications

Differences in Seedling Growth of 23 Creeping Bentgrass Cultivars under Polyethylene Glycol-induced Drought Conditions

Differences in Seedling Growth of 23 Creeping Bentgrass Cultivars under Polyethylene Glycol-induced Drought Conditions

Growth, Quality, and Economic Value Responses of Bedding Plants to Reduced Water Usage

Exogenous calcium-induced physiological and biochemical changes in tree peony (Paeonia section Moutan DC.) under drought stress

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